#include <bits/stdc++.h>

using namespace std;
int v[16001];
int main()
{
    ifstream fin("transport.in");
    ofstream fout("transport.out");
    int n,i,k,medie=0,maxi=-1,st,dr,sum=0,mij,s,nrt;
    fin>>n>>k;
    for(i=1;i<=n;i++){
        fin>>v[i];
        sum+=v[i];
        if(v[i]>maxi){
            maxi=v[i];
        }
    }
    medie=sum/k;
    if(maxi<medie){
        maxi=medie;
    }
    st=maxi;
    dr=sum;
    while(st<dr){
        mij=(st+dr)/2;
     ///   fout<<st<<" "<<dr<<" "<<mij<<endl;
        s=0;
        nrt=1;
        for(i=1;i<=n;i++){
            s+=v[i];
            if(s>mij){
                s=v[i];
                nrt++;
            }
        }
        ///fout<<"nrt = "<<nrt<<endl;
        if(nrt>k){
            st=mij+1;
        }
        if(nrt<=k){
            dr=mij;
        }


    }
 ///   fout<<st<<" "<<dr<<" "<<mij<<endl;
    fout<<st;
    return 0;
}